|
代码是在VC++里面:
CString sql, str; sql.Format(_T("SELECT * FROM tbPatient WHERE admitDate BETWEEN CDate('%s %s') AND CDate('%s %s')"), dtStartDate.Format(_T("%x")), dtStartTime.Format(_T("%X")), dtEndDate.Format(_T("%x")), dtEndTime.Format(_T("%X"))); //时间范围 CTime类型
//字段合并的模糊查询 MYSQL concat(email, address) like 'like%df%' if(!strKeyWord.IsEmpty()) //strKeyWord待查询的关键字 { //SQL Server中IsNull(expression, replace)有替换功能, //str.Format(_T(" AND IsNull(name, ' ') + IsNull(Empid, ' ') LIKE '%%%s%%'"), //strKeyWord.GetBuffer(0)); //Access需要结合IsNull ( expression ), iif (condition, value_if_true, value_if_false )函数
str.Format(_T(" AND iif(IsNull(name),' ',name) & iif(IsNull(Empid),' ',Empid) LIKE '%%%s%%'"),
strKeyWord.GetBuffer(0)); sql += str;
} TRACE1("%s\n", sql);
============================================================================ ps: 上面的%%%s%%是C/C++的格式化字符串输出, %%表示输出%, %s表示输出字符串, 默认给搜索关键字前后加上%号, 这是SQL模糊匹配的符号,
改写
========================================================================
CString sql, str;
sql.Format(_T("SELECT * FROM tbPatient"));
if (!m_bDisplayAll)//非全部显示则添加搜索条件
{
str.Format(_T(" WHERE admitDateBETWEEN CDate('%s %s') AND CDate('%s %s')"),
dtStartDate.Format(_T("%x")), dtStartTime.Format(_T("%X")),
dtEndDate.Format(_T("%x")), dtEndTime.Format(_T("%X")));
sql += str;
//字段合并的模糊查询 MYSQL concat(email, address) like 'like%df%'
if(!strKeyWord.IsEmpty())
{
//SQL Server中IsNull(expression, replace)有替换功能,
//Access需要结合IsNull ( expression ), iif (condition, value_if_true, value_if_false )函数
//str.Format(_T(" AND IsNull(name, ' ') + IsNull(Empid, ' ') LIKE '%%%s%%'"),
//strKeyWord.GetBuffer(0));
str.Format(_T(" AND iif(IsNull(name),' ',name) & iif(IsNull(Empid),' ',Empid) LIKE '%%%s%%'"),
strKeyWord.GetBuffer(0));
sql += str;
}
}
//sql += _T(" ORDER BY ASC");//DESC, 添加排序
TRACE1("%s\n", sql);
| 
QQ好友和群
QQ空间
腾讯微博
腾讯朋友
收藏
淘帖
顶
踩
